DaRo
Due to an occult ritual gone horribly right, Twilight Sparkle finds herself suddenly thrust head-first into the realm of the supernatural, for better or for worse. Will she become the hero Equestria needs, or will she become the very evil she fights? ·InfiniteBrony

AdDaSaTr
Shortly after Twilight's coronation, changelings invade Canterlot again, and Twilight barely escapes with her life. Years later, she wakes up not knowing who she is. She sets out on a quest to remember, because she has to to save Equestria. ·LunarEklipse

Thanks for everything guys. I never expected this thing to get so popular. I need to rework the second chapter, but it looks like there's going to be a blue moon every Friday for a while yet. Thanks again for your support and please keep reading and reviewing!

EDIT2: I've updated the character list again, a little preview of the second story arc...

EDIT 3: Just doing a quick character update to account for changes made to the next Arc...

The changeling queen could produce a dress out of nowhere (cadence in the cave had one, and i assume rarity would have noticed a dress going missing) and it disappears when she changes back, so i assume mimicking some clothing is possible

After checking, the changelings in the actual episode that copy AJ also end up with hats. what happens when you try to take these away from them is anyones guess.

I'm sorry...but I'm still laughing my ass off at the dream within a dream bit. I know it was probably supposed to be super creepy, stressful, terrifying, and help us become one with Twilight's torment...but I just couldn't stop laughing at how ridiculous it was! Haha! Keep up the good work!

Interesting to see which direction this goes. Will Twilight accept her new self and turn all her friends (or at least Pinkie Pie ) into changelings as well? Are all her friends already changelings, along with Spike, all of 'Pony'ville, and the pool where they were relaxing? Will they all toss her out and leave her broken only to reveal that it was just another changeling-induced nightmare and that she is still stuck in that cocoon?

Has potential, especially with your skills. However, one thing: when I was reading the beginning of this chapter, through all the nightmares, it eventually reached a point where I thought, "did this person mistake the 'dark' tag for 'comedy?' " Might think about revising that, because after the first few times it just starts getting ridiculous.

Other than that, I can't really summon anything more specific, but you've already done the recursive nightmares to a sufficient depth for me to appreciate the kind of fear that Twilight must be feeling at this moment.